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(a–d) Gas response of the TiO2 nanobelts and the SnO2-TiO2 hybrid oxides based sensors to 400 ppm methanol (a); ethanol (b); formaldehyde (c); and acetone (d) gases at different operating temperatures; (e) Response/recovery characteristics of the TiO2 nanobelts and the SnO2-TiO2 hybrid oxides based sensors operated at 593 K to 400 ppm methanol, ethanol, formaldehyde, and acetone [105]. Copyright 2012 Royal Society of Chemistry.
